Re: IP_HDRINCL fails on Intel-Mac
Re: IP_HDRINCL fails on Intel-Mac
- Subject: Re: IP_HDRINCL fails on Intel-Mac
- From: Vincent Lubet <email@hidden>
- Date: Thu, 28 Dec 2006 13:49:25 -0800
Stephanie,
Duane is right, this is most likely a byte swapping issue.
The man page ip(4) is wrong when it says "the ip_off and ip_len
fields are in network byte order". In fact they must be in host byte
order.
The man page ip(4) is fixed in Leopard.
Vincent
On Dec 28, 2006, at 1:25 PM, Duane Murphy wrote:
Total shot in the dark, but what about byte swapping?
On PPC the bytes are already in network order on Intel they have to be
swapped.
I have also read reports that some fields have to be swapped while
others don't. (Seems like a nasty bug.) I don't know if that
applies to
your situation or not. I would expect tech notes or some such on the
Apple site.
Just a thought.
...Duane
--- At Thu, 28 Dec 2006 21:57:04 +0100, Stephanie Wist wrote:
Hello,
I have encountered a strange problem: I'm using raw sockets (
socket(AF_INET, SOCK_RAW, IPPROTO_RAW) ) with the option
IP_HDRINCL set
to 1. ( setsockopt(sock, 0, IP_HDRINCL, &one, sizeof(one) ). This
works
fine for me on my Powerbook running on Jaguar and Panther, but
fails on
a new MacbookPro when calling sendto() with EINVAL.
I'm pretty sure that my self-built IP-header is correct, I
compared the
packet-data before sending and they were the same on the Powerbook
and
the MacbookPro.
Am I overlooking something? Is the option IP_HDRINCL disabled by
purpose on the new Macs, as it is on WinXP (although the manpages
state
otherwise)?
Or has anyone a functioning code snippet using raw sockets with
IP_HDRINCL on a MacbookPro?
Wondering,
- Stephanie Wist
...Duane
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